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--- Look! It ____ be Jack on the playground.
---It ____ be him. Because I saw him enter the school library just now.
A. may; mustn’t           B. must; can’t        C. can; can’t  
B

試題分析:句意:看操場上肯定是杰克,那不可能是他,我剛才見到他進入了學校圖書館。must,can(could),may(maight) 可以表示猜測,must 表示肯定猜測,用于肯定句,肯定……,一定……;can’t,表示否定猜測,肯定不……,另外can(could),may(maight),表示可能性猜測,可能……。根據句意,故選B
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